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    [SOLVED]Closed: Re: What is the role of this transistor?

    Current of the buzzer in the emitter resistors of TR2 turns on TR1 which reduces the base voltage if TR2 so that the buzzer current is limited.
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    Closed: Re: how to make diy inverter

    Your idea is to use voltage steps is like this modified sinewave waveform but your peak voltage is 120V instead of the required almost 170V:
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    Closed: Re: how to make diy inverter

    120VAC is 120V RMS that has peak voltages of 170V so the waveform goes from 0V smoothly up to +170V then smoothly down to -170V then smoothly up again to +170V then down again smoothly to -170V over...
  4. Closed: Re: LF398 SPICE MODEL LF398H AND LF398J Pin2 is not defined error in Simulation pro

    The datasheet of the LF398 shows that pin2 is used for an offset voltage adjustment.
  5. Closed: Re: what if i connect a battery to the electromagnet?

    Looking in Google for "18650 Li-Ion battery" shows many pages of ordinary inexpensive 18650 3V to 4.2V ones.
    Looking for "Li-FePO4 battery" shows 3.2V cell batteries of all shapes, sizes and...
  6. Closed: Re: what if i connect a battery to the electromagnet?

    Why do you say 3V when an 18650 Lithium-Cobalt Ion battery cell is dead when its voltage is only 3V? it is 4.2V when fully charged.
  7. Closed: Re: what if i connect a battery to the electromagnet?

    You forgot to tell us the resistance of the electromagnet or the current it draws at the battery fully charged voltage of 4.2V.
    Maybe the resistance of your electromagnet is 0.1 ohms and it will...
  8. [SOLVED]Closed: Re: Converting balnaced supply +12 0 -12 V audio amplifier to 0 +12 supply

    It is not an amplifier since it does not amplify. Its output levels are exactly the same as its input level, except one output is inverted.
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    Closed: Re: Class D amp output current

    The RMS current is 7A but the current peaks will be 9.9A. A breadboard might be destroyed with only 1A.
    A breadboard's rows of contacts and long wires all over the place are antennas that pickup...
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    Closed: Re: Class D audio chip MIX2052

    The MIX2052 power amplifier has a low maximum output power.
    Simply turn down the volume control like on any amplifier so that it is not clipping anymore.
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    Closed: Re: Piezo Buzzer Circuit

    All of the buzzers (transducers) except the "musical" one are in a tuned resonant case at a few high pitched beep frequencies. The loudness is only 85dB to 90dB when it is measured at a distance of...
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    Closed: Re: Piezo Buzzer Circuit

    Please post the datasheet or part number and manufacturer of your 100dB piezo buzzer.
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    Closed: Re: Class D audio chip MIX2052

    The output into a 4 ohm speaker when the supply is 5.0V is 2.2W just below clipping so the 1.5A supply producing 7.5W is more than is needed and will be fine because the amplifier is an efficient...
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    Closed: Re: Piezo Buzzer Circuit

    You want a piezo transducer (speaker) not a piezo buzzer that has a built-in oscillator that produces only one frequency.
    The frequency response of a piezo is all over the place so some frequencies...
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    Closed: Re: Class D audio chip MIX2052

    I answered this before maybe on another website? Over there, didn't you power it with a 3.7V battery?
    The datasheet for the amplifier IC is written only in Chinese and says, "6 Whats, 2 ohms, 5.5V...
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    Closed: Re: LM383 anti-hiss filter

    A speaker's resonance sounds like a bongo drum unless it is damped by the extremely low output impedance (about 0.04 ohms or less) of a modern amplifier. A resistor in series with the output of the...
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    Closed: Re: LM383 anti-hiss filter

    I did not understand. It is still the antique LM383 producing the hiss, not the SSB radio. You cannot filter the LM383 so throw it away and use a better newer audio power amplifier IC.
    Your hiss...
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    Closed: Re: LM383 anti-hiss filter

    Yeah, SSB uses noisy AM modulation and a very narrow audio bandwidth.
    You do not want to use 741 opamps that are 52 years old and produce hiss, and you do not want to make magical Notch or Peaking...
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    Closed: Re: LM383 anti-hiss filter

    Cheap and very old amplifier ICs are not high fidelity so they produce distortion and hiss.
    There are many audio amplifier ICs made today that are high fidelity and produce very low distortion and...
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    Closed: Re: IC TDA2004R Electrical specifications

    THD sounds bad like any amplifier with the volume turned up too high. For acid rock "noises" they like to have lots of fuzz and overdrive distortion. For most other music and speech, distortion...
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    Closed: Re: IC TDA2004R Electrical specifications

    Buy or make a modern amplifier and a power supply for it.


    There are many speaker manufacturers and sellers like Part Express. Most speakers are 8 ohms for a home and are 4 ohms for a car. The...
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    Closed: Re: IC TDA2004R Electrical specifications

    The TDA2004 is very old and has not been made for many years.

    Its maximum allowed supply voltage is 18V when it is playing but can be 28V when it is not playing.
    With your 12V supply and a 1.6...
  23. Closed: Re: Adding a 3 band equalizer to a phantom powered electret mic amp

    Shure dynamic mics for vocals peak mid-high frequencies for "presence" that causes feedback when the gain is too high. But they are directional.
    Electret mics have a flat frequency response but many...
  24. Closed: Re: Adding a 3 band equalizer to a phantom powered electret mic amp

    You do not EQ an audio circuit to eliminate feedback. EQ is used to make good sounds. The mic probably already produces good sounds so do not EQ it which will mess up its sounds.
    To eliminate...
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    Closed: Re: Piezo preamplifier missing cap values

    A piezo transducer is used as the microphone on an e-drum. It picks up taps from the drummer hitting it.
    A piezo beeper has a transistor oscillator circuit in it that you do not want. Instead you...
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